We were there in 06. Crowds weren't bad, but it certainly wasn't empty. If you get there early and use FP, lines should not be bad at all. I think the highest wait we saw was an hour for Space (which had just opened 50th Anniversary) and that was at like the peak of the day crowdwise. Also Monsters Inc. had a long line, but that is only because it had opened a month before. Now Monsters never gets a line longer than 20 min even during peak times.